Mass discharger for a container such as a silo, including a join

Details Mass discharger for a container such as a silo, including a join Mass discharger for a container such as a silo, including a join

1994-08-22

1996-07-30

Keenan, James W.

Material or article handling

Static receptacle and means for charging or discharging, or...

Nongravity discharging means

4141422, 414327, B65G 6538

Patent

active

055405339

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a discharger for discharging peat or other bulk mass from a container, like a silo, and which includes a transfer member that moves the mass from an upper surface of the mass to outside the silo or other container.
Peat is known to be a material that is difficult to store. It easily tends to arch onto the sides of the silo, so that discharge devices on the bottom of the silo only form a hollow inside the peat mass. In winter in particular arching is a very great problem, which attempts have been made to overcome by means of heating and vibration.
There are also known discharge devices operating from above, which may consist of, for example, a screw conveyor installed in the middle of a high cylindrical storage tank. In this case too, however, there is a danger of arching as the screw eats a hollow in the middle of the mass. For a low silo in particular, there is nothing else available than dischargers that operate from below.
The present invention provides a new kind of discharger that operates from above, which does not have the drawbacks mentioned above and which therefore operates reliably in winter too. The characteristic features of a discharger in accordance with the invention are presented in the appended claims. A discharger in accordance with the invention operates so reliably that it can also be used as a batcher. The size of the batch can then be controlled by means of the speed of rotation of the scraper conveyor. With the aid of a discharger in accordance with the invention it is also possible to fill a low silo up to the brim, as the rotating scraper conveyor levels the mass deposited in the silo.
In what follows the invention is illustrated by reference to the accompanying figures, which show one discharger in accordance with the invention in connection with a sludge treatment unit.
FIG. 1 shows a cross-section of a silo equipped with a discharger in accordance with the invention.
FIGS. 2a and 2b show side and top views of a separate scraper conveyor.
FIG. 3 shows the installation of a silo including a discharger in accordance with the invention in connection with a sludge treatment unit.
Referring to the drawings in detail, a silo 1 is constructed on a casette base 2. The side 1.2 of the discharge end and the base 1.1 of the silo are marked separately. The top of the silo 1 includes a cover construction 7, in which there is a feed opening and sides 9 running round it. A disk screen 8 is arranged inside the silo, next to the opening. A scraper conveyor 4, which is shown in three different positions in FIG. 1, is connected by means of joint 3 formed in axle 23 next to the discharge opening in the cover construction 7. The situation shown by a solid line shows the silo empty and the position K shows the silo full, while one intermediate position is drawn between them.
The scraper conveyor 4 consists of moving scrapers 4.1 and a joint 5, which makes it possible to turn the scraper conveyor against the sides 1.2 and the bottom 1.1. The Figure shows the auxilliary wheel 6 required in the jointing. The scraper conveyor rotates in such a way that its lower part moves in the direction of the side 1.2 and the mass is thus scraped from the surface over the edge of the silo to the conveyor 12. The scrapers 4.1 are of L-section steel welded to a chain 17. Other shapes such as T-section can be used, but it is advantageous to set the free flange or the hollow of the scraper against the mass, in which case it can tear open the surface of a frozen mass.
During filling, the scraper conveyor is raised into position K by means of the raising device 10 and cables 11 and is then started. As the mass drops from the feed opening through the disk screen 8 and the scraper conveyor 4, the scraper conveyor levels the mass in the silo 1 and achieves the precise filling of the entire silo 1.
During operation, the scraper conveyor is not attached other than at the jointing 3 and it rests its own weight on top of the peat mass in the silo.
FIGS. 2a and 2b show the construction of the scraper conve

REFERENCES:
patent: 231721 (1880-08-01), Imhorst
patent: 4020956 (1977-05-01), Van Hille
patent: 4042094 (1977-08-01), Schmermund
patent: 4042129 (1977-08-01), Hampton
patent: 4350467 (1982-09-01), Soros
patent: 5372468 (1994-12-01), Ihle

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